Infrastructure
Hosting, databases, storage, email, app-store accounts, and background services keep the applications available.
Donations help cover the ordinary costs of keeping them useful: hosting, databases, app maintenance, audio generation, indexing, and ongoing development. Free and ad-free means no premium gate and no advertising; giving stays voluntary and separate from access.
These are practical operating costs, not premium features or gated access.
Hosting, databases, storage, email, app-store accounts, and background services keep the applications available.
Source preparation, proofreading, audio generation, indexing, and search improvements take steady time.
Free apps still need security updates, platform migrations, bug fixes, and device compatibility work.